# containerd [containerd] An industry-standard container runtime with an emphasis on simplicity, robustness and portability Kubespray supports basic functionality for using containerd as the default container runtime in a cluster. _To use the containerd container runtime set the following variables:_ ## k8s_cluster.yml ```yaml container_manager: containerd ``` ## etcd.yml ```yaml etcd_deployment_type: host ``` ## Containerd config Example: define registry mirror for docker hub ```yaml containerd_registries: "docker.io": - "https://mirror.gcr.io" - "https://registry-1.docker.io" ``` `containerd_registries` is ignored for pulling images when `image_command_tool=nerdctl` (the default for `container_manager=containerd`). Use `crictl` instead, it supports `containerd_registries` but lacks proper multi-arch support (see [#8375](https://github.com/kubernetes-sigs/kubespray/issues/8375)): ```yaml image_command_tool: crictl ``` [containerd]: https://containerd.io/